It also takes hours to compile everything from scratch, but we don't see computers taking hours to boot, do we? Most of the process "from initial state" is cach

It also takes hours to compile everything from scratch, but we don't see computers taking hours to boot, do we? Most of the process "from initial state" is cached, and there is little reason to not keep the trend. Booting, as in detecting and initializing the hardware, including the RAM, should only be needed when hardware is changed, and even then it should be possible to cache the state of any unchanged parts.